Nissan Frontier D40. Manual - part 732

INTAKE DOOR MOTOR

HAC-31

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

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HAC

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1.

Press any button on the front air control to back out of self-diag-
nostic mode.

2.

Check voltage between front air control harness connector M50
terminal 21 and terminal 22 while placing the front air control
into self-diagnostic mode. Refer to 

HAC-17, "Front Air Control

Self-Diagnosis"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace front air control. Refer to 

VTL-7, "Removal and Installation"

.

4.

CHECK INTAKE DOOR MOTOR AND CIRCUITS FOR OPEN

1.

Turn ignition switch OFF.

2.

Disconnect the front air control harness connector.

3.

Check continuity between front air control harness connector
M50 terminal 21 and terminal 22.

Is the inspection result normal?

YES

>> Replace intake door motor. Refer to 

VTL-17, "Removal

and Installation"

.

NO

>> GO TO 5.

5.

CHECK INTAKE DOOR MOTOR CIRCUITS FOR OPEN 

1.

Disconnect the intake door motor harness connector.

2.

Check continuity between front air control harness connector
M50 (A) terminals 21, 22 and the intake door motor harness
connector M58 (B) terminals 1, 6.

Is the inspection result normal?

YES

>> Replace intake door motor. Refer to 

VTL-17, "Removal

and Installation"

.

NO

>> Repair or replace harness as necessary.

Connector

Terminals

Condition 

Voltage 

(Approx.)

(+) (-)

Front air control: 

M50

22 21

Self-diagnostic 

mode

Battery 
voltage

AWIIA0399ZZ

Continuity should exist.

AWIIA0400ZZ

21 - 6

: Continuity should exist.

22 - 1

: Continuity should exist.

AWIIA0401ZZ

HAC-32

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

BLOWER MOTOR

BLOWER MOTOR

System Description

INFOID:0000000005275884

Component Parts

Blower speed control system components are:

• Front air control
• Variable blower control
• Front blower motor
• Front blower motor relay

System Operation

COMPONENT DESCRIPTION

Variable Blower Control

The variable blower control (1) is located on the heater and cooling
unit assembly. The variable blower control receives a gate voltage
from the front air control to steplessly maintain the blower motor volt-
age in the 0 to 5 volt range (approx.) 

⇒↓

:front.

Front Blower Motor Component Function Check

INFOID:0000000005275885

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - FRONT BLOWER

1.

Rotate the blower control dial clockwise. Blower should operate.

2.

Rotate the blower control dial clockwise, and continue checking blower speed until all speeds are
checked.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to 

HAC-33, "Front Blower Motor Diagnosis Procedure"

.

AWIIA1209ZZ

AWIIA1225ZZ

BLOWER MOTOR

HAC-33

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

C

D

E

F

G

H

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A

B

HAC

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Front Blower Motor Diagnosis Procedure

INFOID:0000000005275886

Regarding Wiring Diagram information, refer to 

HAC-50, "Wiring Diagram - Air Conditioner Control - With

VBC"

.

SYMPTOM: Blower motor operation is malfunctioning.

DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR

SYMPTOM: Blower motor operation is malfunctioning under starting
blower speed control.

1.

CHECK FUSES

Check 15A fuses [No. 24 and 27 (Located in the fuse and fusible link box)]. For fuse layout. Refer to 

PG-80,

"Terminal Arrangement"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 9.

2.

CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT 

1.

Turn ignition switch OFF.

2.

Disconnect front blower motor connector.

3.

Turn ignition switch ON.

4.

Press the A/C switch.

5.

Rotate blower control dial to maximum speed.

6.

Check voltage between front blower motor harness connector
M62 terminal 2 and ground.

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> GO TO 3.

3.

CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) POWER SUPPLY CIRCUIT

AWIIA1211GB

Fuses are good.

2 - Ground

: Battery voltage

WJIA1331E

HAC-34

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

BLOWER MOTOR

1.

Turn ignition switch OFF.

2.

Disconnect front blower motor relay.

3.

Check voltage between front blower motor relay harness con-
nector terminals 5,7 and ground.

• E54 (King Cab)
• E55 (Crew Cab)

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector.

4.

CHECK FRONT BLOWER MOTOR RELAY

Turn ignition switch OFF.
Check front blower motor relay. Refer to 

HAC-37, "Front Blower Motor Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace front blower motor relay.

5.

CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) CIRCUIT FOR OPEN

Check continuity between front blower motor relay harness connec-
tor terminals 3, 6 and front blower motor harness connector M62 ter-
minal 2.
• E54 (King Cab)
• E55 (Crew Cab)

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair harness or connector.

6.

CHECK VARIABLE BLOWER CONTROL POWER SUPPLY CIRCUIT FOR OPEN

1.

Disconnect variable blower control harness connector.

2.

Check continuity between front blower motor relay harness con-
nector (A) terminals 3, 6 and variable blower control harness
connector M121 (B) terminal 4.

• E54 (King Cab)
• E55 (Crew Cab)

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair harness or connector.

7.

CHECK FRONT BLOWER MOTOR RELAY (COIL SIDE) GROUND CIRCUIT

Check continuity between front blower motor relay harness connec-
tor terminal 2 and ground.
• E54 (King Cab)
• E55 (Crew Cab)

Is the inspection result normal?

YES

>> GO TO 8. 

NO

>> Repair harness or connector.

5, 7 - Ground

: Battery voltage

WJIA1634E

3, 6 - 2

: Continuity should exist.

WJIA1333E

3, 6 - 4

: Continuity should exist.

AWIIA1212ZZ

2 - Ground

: Continuity should exist

AWIIA1227ZZ